Most Amazon Web Services offer a Regional endpoint that you can use to make your requests. The general syntax of a Regional endpoint is as follows.
The following table lists the name and code of each Region.
|US East (Ohio)
|US East (N. Virginia)
|US West (N. California)
|US West (Oregon)
Some services, such as IAM, do not support Regions. Thus, the endpoints for those services do not include a Region. Other services, such as Amazon EC2, support Regions but let you specify an endpoint that does not include a Region, such as ‘https://ec2.amazonaws.com’. When you use an endpoint with no Region, AWS routes the Amazon EC2 request to US East (N. Virginia) (us-east-1), which is the default Region for API calls.